VLT/NACO H (left) and K_s (right) images of the PSR J1124-5916 field smoothed with a Gaussian kernel of 3 × 3 pixels. The cross and circle in the H image are the X-ray pulsar position and its 1σ uncertainty. The faint object “o1” is detected in both bands and its magnitudes are accepted as stellar-like object detection limits of the images. The contours are overlaid from the V-band image (Zharikov et al. 2008). The ellipse and rectangle in the K_s image show the aperture and background region, respectively, used for the PWN photometry.